The steam turbine fire-resistant oil system has strict requirements on the response speed of the solenoid valve, especially in key scenarios such as valve control and overspeed protection. Millisecond-level delays may cause the unit to lose control. With the optimized electromagnetic-mechanical structure design, the solenoid valve 4WE10Y-L3X/CG220NZ5L can achieve a full-stroke response time of ≤15ms, meeting the dynamic adjustment requirements of the EH oil system.

I. Fast response design of the solenoid valve 4WE10Y-L3X/CG220NZ5L

The solenoid valve adopts a dual-coil redundant drive + low-inertia armature structure:

1. Low inductance coil: winding resistance 18Ω, inductance 0.12H, after power-on, the current rises to the threshold (about 0.8A) in only 3ms.

2. Lightweight moving parts: The armature mass is 12g, and with the reset spring with a preload force of 8N, the mechanical action delay is controlled within 5ms.

3. Direct-acting slide valve design: valve core stroke 3mm, full action time 7ms, 40% faster than pilot structure.

II. Matching of response time and EH oil system requirements

1. Dynamic requirements of valve control

The EH oil system needs to complete the valve opening adjustment within 50ms. The response characteristics of the solenoid valve 4WE10Y-L3X/CG220NZ5L are as follows:

• Signal reception to valve core start: 5.5ms (current reaches the starting force threshold)

• Valve core fully open/fully closed: 12ms (including mechanical inertia compensation)

• Oil pressure build-up/release: 30ms (when the oil circuit volume is 2L)

Actual measurements show that the valve can support the valve action frequency of 8-10 times per second, meeting the needs of rapid load adjustment.

2. Emergency response of overspeed protection (OPC)

When the turbine speed exceeds 3090rpm, the OPC solenoid valve needs to release safety oil within 20ms:

• After the solenoid valve 4WE10Y-L3X/CG220NZ5L is powered on, the oil drain port is fully opened within 15ms, and the oil pressure drops from 14MPa to 2MPa in only 25ms.

• The dual-valve parallel design ensures that protection can still be triggered when a single valve fails, and the system reliability reaches 99.99.

III. Anti-interference design and long-term stability

1. Environmental adaptability:

• The coil adopts H-grade insulated enameled wire, which can withstand temperature fluctuations from -40℃ to 150℃.

• The valve body seal meets the IP67 standard to prevent the intrusion of moisture or particles in EH oil.

2. Life guarantee:

• After 107 fatigue tests, the stroke error of the armature-spool assembly is less than 0.1mm.

• The surface roughness of the hard chrome-plated slide valve Ra≤0.2μm reduces the risk of delay caused by friction.

IV. Maintenance optimization and performance verification

1. Regular inspection items:

• Coil resistance: measured every quarter, and replacement is required if the deviation exceeds ±10%.

• Action time: use an oscilloscope to monitor the current-displacement curve, and trigger an early warning when the full stroke time exceeds 18ms.

2. Oil circuit cleaning management:

• Maintain the cleanliness of EH oil to prevent particles above 5μm from blocking the valve core, and flush the oil circuit filter every year.

The solenoid valve 4WE10Y-L3X/CG220NZ5L compresses the response time to 15ms through electrical-mechanical coordinated optimization, which perfectly meets the dual requirements of speed and reliability of the turbine fire-resistant oil system. Regular maintenance and oil quality management can further ensure its long-term stable operation.

When looking for high-quality, reliable solenoid valves, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

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